SNDCTL_DSP_MAPINBUF 689 include/uapi/linux/soundcard.h #define SOUND_PCM_MAPINBUF SNDCTL_DSP_MAPINBUF SNDCTL_DSP_MAPINBUF 2686 sound/core/oss/pcm_oss.c case SNDCTL_DSP_MAPINBUF: SNDCTL_DSP_MAPINBUF 2689 sound/core/oss/pcm_oss.c cmd == SNDCTL_DSP_MAPINBUF ?